Currently, we have a significant number of articles whose titles cannot be properly represented in MediaWiki because they use restricted characters. For example, the article [[Benzo(a)pyrene]] is actually supposed to be under "Benzo[a]pyrene", but MediaWiki doesn't permit brackets in titles.
I propose a proper escaping syntax for titles that would remove this limitation. Just as the title "C++" may be linked to by [[C%2B%2B]], "Benzo[a]pyrene" would be linkable by [[Benzo%5Ba%5Dpyrene]]. While editors would have to be educated about percent-encoding, this solution would make sure that the title shows up correctly in watchlists, logs, etc. Further, it would not lend itself to the rampant abuses offered by disabling $wgRestrictDisplayTitle.